BOSTON SUSPECT 2 HAS A MILLION DOLLAR QUESTION TO ANSWER

Perhaps the only man in the world who can explain why the Boston Marathon bombings took place is sedated with a tube down his throat, unable to speak.

Suspect Dzhokar Tsarnaev was in serious but stable condition at a Boston hospital and cannot talk, Massachusetts Gov. Deval Patrick told reporters.

"I, and I think all of the law enforcement professionals, are hoping for a host of reasons that the suspect survives, because we have a million questions, and those questions need to be answered," the governor said Saturday.

"There are parts of the investigation, in terms of information and evidence, that still needs to be run to ground."

As Tsarnaev remains under heavy guard at

the hospital, new details have emerged in the case. Here are the latest developments:

Authorities have not publicly detailed how Tsarnaev was injured, but a federal official said the teen has injuries to the throat.

An official who has been briefed on the case said the 19-year-old was "intubated and sedated."

Authorities have not publicly said what charges will be filed against the teen. 

Although Massachusetts does not have a death penalty, prosecutors could seek the death penalty at the federal level, the Justice Department official said.

The government has invoked the public safety exception, a designation that allows investigators to question the teen without reading him his Miranda rights and without a lawyer present, said another Justice Department official, also speaking on condition of anonymity.

The chief of police where Tsarnaev was captured said officers did not question the suspect immediately after he was found.

"There was no interviewing at the scene. He needed aid, and we got him to the hospital," Watertown Police Chief Edward Deveau said.